I don't think there is any alternate coin that could somehow replace bitcoin being the alpha of all the cryptocurrencies.
It's value can may be matched by ETH for instance, but it can never be surpassed, IMO.
No bitcoin cannot be replaced by any other cryptocurrency because all of the cryptocurrencies like ETH,LTC etc increase with respect to bitcoin.I don't think that any other cryto can surpass bitcoin.It is famous all over the world and people accept payments in boicoin rather than any other crypto.It's value can may be matched by ETH for instance, but it can never be surpassed, IMO.